Small Scale Modelling of Concrete Structures by L.F.BOSWELL, F A Noor, L.F. Boswell

By L.F.BOSWELL, F A Noor, L.F. Boswell

This publication is a entire consultant to the thoughts and fabrics for exact small-scale modelling with chapters by means of major overseas researchers and engineers. particularly, impression, earthquake and dynamic difficulties are offered for the 1st time protecting bolstered and pre-stressed concrete.

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1. Stress state. The specimen strength is strongly influenced by the state of stress and the strain gradient across the specimen cross-section. All of these strengths have been shown to increase with a decrease in the specimen size and with an increase in the strain gradient. 2. End conditions of compression specimens (flatness and parallel ends) influence the strength. Higher accuracy of capping in smaller specimens leads to higher observed strengths. 3. Testing machines. The stiffness characteristics of the testing machine and the loading platens have a strong influence on the measured strengths and the accompanying stress-strain curves.

In Reinforced and Prestressed Concrete Models. The Construction Press, London, 1980. , A theoretical and experimental investigation of box girder bridges. PhD thesis, City University, London, 1974. N. , Materials for structural models. In Proc. of the ACI Symposium on Models of Concrete Structures, Dallas. Am. Conc. , Detroit, MI, 1972, pp. 19â 112. A. , Modelling the stress strain relationships of structural concrete. Magazine of Concrete Research, 34 (1982). , Raveendran, S. , Production and use of high yield model reinforcement.

43 Similar specimens reinforced with plain wires and threaded rods were tested to obtain data for comparison with the results from the deformed wires. The pull-out specimen was instrumented with a transducer and a load cell which enabled a direct plot of the bond stress-slip relationship. Some of the resulting bond stress-slip relationships are shown in Fig. 18. < previous page page_66 next page > < previous page page_67 next page > Page 67 SMALL SCALE MODELLING OF CONCRETE STRUCTURES 55 56 SMALL SCALE MODELLING OF CONCRETE STRUCTURES *Bond stress calculations are based on an average diameter of 2 mm.

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